Keyboard controlled margin stop adjustment



April 7, 1953 w. T. SAGNER KEYBOARD CONTROLLED MARGIN STOP ADJUSTMENT Filed June 28, 1949 4 Sheets-Sheet l INVENTOR. l WALTER TSAG/VER BY 9 April 7, 1953 w. T. sAGNER 2,633,964

KEYBOARD CONTROLLED MARGIN STOP ADJUSTMENT Filed June 28, 1949 4 Shees-Sheet 2 INVENTOR. WALTER 7. SAGNER BY 9am 6&5?

April 7, 1953 w. T. SAGNER 2,633,964

KEYBOARD CONTROLLED MARGIN STOP ADJUSTMENT Filed June 28, 1949 4 Sheets-Sheet 5 INVENTOR. WALTER TSAGNER April 7, 1953 w. T. sAGNl-:R

KEYBOARD CONTROLLED MARGIN STOP ADJUSTMENT Filed June 28, 1949 4 Sheets-Sheet 4 KEY ' INVENTOR. WAL 75;? 7.' SAG/VER Patented pr. 7, 1953 UNITED KEYBOARD CONTROLLED MARGIN STOP ADJUSTMENT Walter T. Sagner, West Hartford, Conn., assignor to Underwood Corporation, New York, N. Y., a

corporation of Delaware Application June 28, 1949, Serial No. 101,739

31 Claims. 1

This invention relates to typewriting machines and more particularly to mechanisms for adjusting carriage arresting stops, such as margin stops, to desired positions by manipulations involving stop-shifting movement of the carriage, without the operator ever laying hands directly on such stops.

Stop setting mechanisms of this general species have been devised particularly for typewriting machines wherein the stops to be adjusted are located behind the paper supporting devices and are inconvenient for access.

In recent year, inventors have aimed to provide for more convenient adjustment of such inaccessibly located stops. In some structures devised, the stops are released and spring-moved toward an associated counterstop in response to an operation of a manipulative member provided on the carriage or in the keyboard of the machine. The procedure in connection with such devices calls for tedious and laborious manual movement of the carriage in the appropriate direction to bring the carriage to the exact position in which it is desired to have the stop engage the counterstop. At the proper moment in the procedure the stated manipulative member must be restored to secure the stop in the new position of adjustment. The manipulative procedures generally require movements of the operators hands from and to the keyboard, are tedious, tiresome and confusing and an operator is often discouraged from making desirable margin stop adjustments, except when the reasons are absolutely compelling for doing it. Moreover, in this particular type oi mechanism the procedure must be radically varied depending on whether a stop is required to be shifted outwardly or inwardly from the old position. This condition is apt to confuse the operator and in any event calls for considerable mental effort.

In other known structures, preparatory to effecting a margin stop adjustment, the carriage must iirst be hand-moved leitwardly or right- Wardly, to bring the stop which is required to be adjusted against the counterstop. After such manual movement of the carriage is completed, and not before, a control must be actuated to release the stop for adjustment and to render it stationary with respect to the counterstop. Still more subsequently, the carriage is required to be moved by manual eiort, in a cumbersome and time-consuming manner, to the position corresponding to where the stop is required to be stationed. Additionally, as part of the procedure,

the margin stop releasing control must then be i restored to cause the locking oi the stop in the newly established position.

In either or" the above outlined species of structures, the stop adjusting operations become taxing to the operator in view of varying requirements oi procedure, which involve hand movements from the keyboard, and particularly also in the face of carriage movements which must be imparted tediously by manual effort and at the proper time, and with much exercise of mental j udgment.

According to prior mechanisms it is particularly not feasible to eect margin stop adjustments, reliably and speedily, by convenient and light manipulative action conined entirely to the keyboard of the machine or to the immediate proximity thereof.

With a View or eliminating the deficiencies of prior devices, it is an important object of the present invention to provide mechanism for efiiciently effecting adjustments or^ stops by remote control, rapidly, through easy, non-fatiguing, simple manipulative action on the part of the operator, and without any sacrifice or impairment of conventional typewriter functions.

It is a further object to accomplish the foregoing object by conveniently manageable manipulative means that are in the keyboard of the machine or immediately adjacent thereto, and which provide for high speed adjustment of the stops in either direction followed, if necessary, by precise incremental adjustment to the exact position desired.

It is another object of the invention to provide for eicient, remote-control stop adjustment by provision of power agencies for doing all heavy Work, and particularly also by provision oi powermeans to step-wise move the carriage in either direction to the end of efiecting all margin stop adjustments expeditiously with precision and with least eiort and possibility for mental confusion.

It is also an object of the invention to provide an eiciently manipulative margin stop adjusting device which has no delicate spring means to effect movements of the stops against a counterstop.

It is moreover an object to provide a device of the type stated, in which a margin stop unlocking or releasing key may be operated prematurely, before the positioning of a margin stop against the counterstop, provision being made to delay the stop releasing action of the device until such time as the margin stop is in a relation of engagement with the counterstop, thus avoiding a 3 serious objection to prior devices which require that the margin stop unlocking mechanism be operated at a special point in a sequence to prevent loss of control of the margin stop and a consequent failure in the setting operation.

It is also an object of the invention to provide a device of the nature stated, which will unlock a margin stop from its support for adjustment only following the bringing of a margin stop against the counterstop, and which device concomitantly to unlocking a stop will securely hold it in a xed relation to the counterstop.

A still further object is to provide a reliably operative, rugged Stop releasing mechanism -which is incapable of effective actuation until or unless a stop to be adjusted is first brought into appropriate relation with the counterstop.

A general object is also to provide-amechanism of the stated purpose, which is rugged in vstructure, accurate in operation, and not subject to stall or tie up the machine due to improper manipulation.

In conjunction with a line-end locking mechanism for typing instrumentalities and a poweroperated carriage stepping mechanism, it Vis an object to provide means whereby a special manipulative control for causing repeated action of said carriage stepping mechanism, when operated, renders the line-end locking mechanism incapacitated in regards to the said power-operated stepping mechanism.

Other objects of the invention will become evident in the light of the detailed description of the preferred embodiment of the invention which follows.

Now referring to the drawings:

Figure l is a skeletonized, sectional side view of a typewriter embodying a carriage, as viewed from the right side of the machine, some of the mechanism being shown whereby adjustment of margin stops is advantageously eifectable,

Figure 2 shows a device to eifect repeated step movements of the carriage to the end of eiecting adjustments of the margin stop leftwardly on the carriage,

Figure 3 is a sectional front elevation of the rear portion of the typewriter, and including some of the mechanism for effecting margin stop adjustments,

Figure 4 is an enlarged front elevation of a margin stop also seen in Figure 3,

Figure 5 is a fragmentary perspective View showing mainly a portion of the mechanism for unlocking the margin stops for adjustment,

Figure 6 is a perspective view illustrating a margin stop unlocked from its support for adjustment, and having been rendered concomitantly stationary with respect to a counterstop,

Figure 7 is a diagrammatic plan view of a typewriter keyboard, embodying manipulative means to effect eiciently adjustments of the margin stops,

Figure 8 is a fragmentary front elevation of a margin stop unlocking device in a state of readiness for resultful action on a margin stop just as soon as such stop moves a little more leftwardly.

Figure 9 is a skeleton perspective view of a margin stop controlled line-end locking mechanism for the typing instrumentalities and a carriage spacing mechanism, the latter including a letter-feed actuator, having associated therewith key-means to call it into operation independently of the locking mechanism,

Finally, Figure 10 is a plan view of part of a i mechanism used for leftward adjustment of the margin stops.

Referring now more particularly to the sectional side view of Figure l, a carriage l5 includes two spaced end plates I9 connected by a rail I5. Said rail is guided to travel lineally between two parallel trackways I8 by use of anti-friction elements ll, said trackways is being carried upon spaced side walls 2t of the main framework of the machine. The carriage includes a usual platen roll 2l for support of work sheets. A usual `complement of types are adapted to strike against the front side of the platen at a common printing point, as indicated by a type bar 22 shown in dot and dash lines. The carriage is urged constantly in leftward, letter-feed direction under the power of a spring motor 23 having a draw .band connection 24 with the carriage, but a usual letter-feed escapement 25 associated with an escapement wheel 26 is normally in control over the carriage to hold it against the urge of said spring Vmotor 23. A vertically disposed shaft 2'! operatively connects said escapement wheel with a pinion 28 which is -in mesh with a letter-feed rack 3G supported on and partaking of the movements of the carriage l5. Said escapement 25 comprises a rocker frame 33 carrying a holding dog 3l which is normally in carriage holding engagement with one of the teeth of the escapement wheel 25, but which in a usual manner permits free travel of the carriage rightwardly in carriage return direction. The rocker frame 33 comprises also a stepping dog 34, and is pivoted on an axis 29 which extends transversely of the machine. At each typing operation and at each word spacing operation the escapement rocker 33 receives a momentary downward rocking motion, swinging the holding dog 3l clear of the teeth of the escapement wheel 25 and temporarily swinging the stepping dog 3i?- between two teeth of the escapement wheel to permit the latter to turn somewhat less than a letter-feeding step. Responsive t0 the return motion of the rocker 33, which follows immediately, the escapement wheel will complete its letter-feeding step, the end result being that the carriage will have letterfed one space.

The operating mechanism for the type bars 22 may correspond to that shown in the patent to Yaeger, No. 2,254,764, dated September 2, 1941, namely type keys 3 in a keyboard Sil, see Figure '7, by the means disclosed in the stated patent, are adapted to engage selectively vtype bar actuators 3? with a constantly rotating toothed power member 3B, said means including a hook member Il@ for engaging each actuator, see Figure 9. Each operation of a type bar 22 results in a letterfeeding step of the carriage Vby an actuation of the escapement 25, in a conventional manner.

The normal limits of carriage travel are adjustably established by a left and a right margin stop, respectively numbered le and 45, which stops cooperate with a counterstop 46. In the embodiment of the invention shown, the margin stops 4d and 45 are supported for adjustment in parallel to the carriage, on a toothed rack bar 41 which is carried fast on the opposite end plates 48 of the carriage I5. As best seen in Figures 3, 4, 5 and 6, the individual margin stops comprise each a block or body having a rectangular perforation 5l extending lengthwise of the carriage for slidable accommodation of the stop on the rack bar 41. Each of the stops d4, 45 is normally locked lengthwise on the rack bar by means of a lock slide 52 accommodated in the stop for downward movement in a vertical slot y53 which is closed at the front. Said lock slides 52 are confined for downward movement between the closed front side of the slot 53 and the front side of the bar 41, and each has a rearwardly reaching nose 54 for meshing upwardly in the tooth notches 55 of the rack 41. Compression springs 56 underlying horizontal flanges of the lock slides t urge the latter constantly upwardly for stop locking engagement of the nose 54 with the rack 41. The lower ends of the springs 56 are accommodated in socket holes provided in the stop bodies, as shown. It will thus be seen that adjustment of either of the margin stops 44, 45 entails movement of the appropriate lock slide 52 downwardly. Such stop-releasing movements of the lock slides 52 are eected under keyboard control in a manner which will be brought out later.

The counterstop 46, see Figure 9, comprises the upper end of an upright arm 66 which is disposed approximately mid-way between the side walls E!) of the typewriter, the counterstop 46 protruding upwardly through a rectangular perforation 6| in a top plate 62 of a small mechanism supporting housing 63. The counterstop arm Gli has at its lower `end a vertical slot 64, and extending through this slot for mounting the arm is a headed stud 65, the latter projecting rigidly from the rear of a cross member 66 of the framework. A spring 61 urges normally the counterstop arm 60 upwardly to the limit provided by the lower end of the slot 64, and another spring 68 has a rightward action on the arm 66 for the counterstop end 46 to abut normally the right side of the perforation 6|. The left margin stop 44 is normally at the left of the counterstop 46, whereas the right margin stop is normally at the right thereof, the margin stops having stop faces oppositely facing t0- ward the counterstop 46.

In the course of typing a line, the carriage travels leftwardly, and if the right margin stop travels sufficiently far it will engage the counterstop 46 to displace it leftwardly a distance substantially equivalent to a letter-feed space. This displacement of the counterstop, as will be brought out later, serves to lock the typing mechanism, as well as a word spacing mechanism against operation.

As has been stated hereinabove, it is an important object of the invention to adjust the margin stops selectively by easy manipulative action coniined `entirely to the keyboard. The stop adjusting operation involves successive operative stages, comprising, power movement of the carriage in appropriate direction to bring first the stop to be adjusted against the counterstop 46, unlocking of the appropriate margin stop and the rendering of such unlocked stop stationary with respect to the frame, power movement of the carriage step-wise, rapidly, either to the right or to the left while the unlocked stop remains stationary with respect to the counterstop, thereby to eect a stop adjustment, and iinally a restoration of the machine to a normal state, wherein the newly adjusted margin stop is locked in its new position on its support.

If adjustment of the right margin stop 45 is required, the operator depresses a tabulator key 1| to cause propulsion of the carriage I5 leftwardly under power of the carriage feed motor 25, thereby to bring the margin stop 45 into lineend limiting engagement with the counterstop 46. If the left margin stop 44 is to be adjusted, the operator depresses either one of two carriage return keys 12, responsive to which there will ensue a power-driven movement of the carriage |5 to the limit determined by the engagement of the margin stop 44 with the counterstop 46.

The tabulating mechanism for bringing the stop 45 against the counterstop may be substantially as disclosed in the patent to Helmond, No. 2,303,878, dated December l'1, 1942, in which a tabulator key like the one herein numbered 1| in Figure '7, upon depression causes an upward power actuation of a link 13 seen in Figure l. Said upward actuation of the link 13 is elected by an actuator similar to the type-action actuator 31 seen in Figure 9, and the said link in turn rocks a lever 14 about a stationary fulcrum rod 15, and projects a tabulator reed upwardly. When so projected, the reed 16 may be in carriage intercepting range with any tabulator stop 11 carried on a rack 18 and set downwardly thereon to a potentially effective position. The forward end of the lever 14 has a pin-and-fork connection with a lever 86 which is pivoted at 8| and has a down-reaching arm 82 for displacement of the holding dog 3| of the escapement clear of the escapement wheel 26. Thus whenever the tabulator reed 16 is projected in response to operation of the key 1|, the holding dog 3| is thrown concomitantly free of the escapement wheel, and the carriage resultingly will be power driven in leftward direction by the spring motor 23.

The tabulator reed 1&5 is normally in the lower position seen in Figure 1, and such position is established under the tension of a spring S3 which pulls the reed downwardly, and the upper end rightwardly, the upper end of the reed being accommodated in a rectangular hole le with capacity for some rightward displacement, and motion of the reed in downward direction being limited by a rcd t4 wherewith the upper end or a slot in the reed engages. Said tabulator reed 16 has a rightwardly extending shoulder e5 which under the rightward urge or" the spring S3 latches or catches over a small shelf Sie as the reed reaches projected position. When tabuiations are effected to station the carriage in tabulated positions intermediate the limits of carriage travel established by the margin stops 4d, 45, the reed 16 projected in response to the operation oi the tabulator key 1| is encountered by the downwardly set tabulator stop 11 in range thereof to the right. The tabulating run is terminated when such tabulator stop disp-laces the reed ifi leftwardly to the limit permitted by the hole 19. When this happens the reed shoulder 85 slips off the shelf 86, and enables the spring i3 to restore the tabulator reed 16, the holding dog of the escapement consequently regaining control over the carriage l5 to hold the latter in the newly attained position.

When the right margin stop 45 is to be brought into line-end limiting engagement with the counterstop 46, as the irst step in an adjusting operation for such stop, the tabulator key 1| may have to be operated several times to cause the carriage to move sufiiciently far. Moreover, there may be no tabulator stop 11 set to cause the restoration of the reed 'Z6 when the margin establishing engagement takes place between the stop d5 and the counterstop. To assure restoration of the reed 16, the leftward displacement of the counterstop arm 6d in the line-end limiting engagement is utilized to cause restoration of the reed 16. Specifically, a pin 3E projecting rearwardly from and fast on the counterstop arm 6d, see Figure l, by engagement with the right side of 7 the tabulatcr .reed it will effect a ileftwarddisplacement ofthe .latter to free -the shoulder 85 .from the shelf cte, and Vthereby will cause the riage is .thus left unobstructed by the tabulating `reed '15 when subsequently .the `carriage is moved to eiect margin .stop adjustment. Obviously, also, the control of the escapement 25 over the escapement rwheel is restored automatically at .theend of the stated tabulation.

If Aitis the left margin stop @it that is required to be adjusted, then as a rst step in the adjusting .procedure the carriage is preferably power-moved rightwardly to .bring such stop M into movement-limiting engagement with the counterstop d5. Such power movement of the carriage is elfected under control of either one of vthe .aforesaid carriage return keys 72, and the .mechanism which is responsive to such lkeys may 'be substantially that disclosed in the patent to Helmond'No. 2,262,676, dated November l1, 1941, and will now be described briefly in particular reference with Figure 3.

Carriage return motion is impartable to the carriage .through a iiexible strap 'di extending from a strap-winding drum S2 -to a part, not

shown, of a line-spacing mechanism on the carriage I 5. The strap 9i extends from the drum 92 over several guiding elements, one of which is shown at 9S. The drum 532 is normally rotatively free on a shaft ile and has associated therewith a very lightly active spring motor d to turn it and take up the slack in the str-ap 9| Also turnably free on the shafted is a clutch element S6 which has a splined connection, not shown, with the pulley 32. This permits the element 96 to be moved axially on the shaft, into clutched association with a gear Si that is fast on the shaft SI2, the said element -95 and the gear''l having clutch teeth 98 normally separated from each other. A pinion shaft ID3, constantly driven by an electric motor, not shown, drives the gear .91, but the clutch embodying the clutch teeth S8 being normally open, the strap QI exerts normally no carriage returning pull on the carriage. The clutch element 95 is normally held in open clutch position by a latch mechanism comprising a latch ft, see Figure 3. Said latch iG is pivotally supported at IE on the right side plate of the machine and a shoulder thereof normally overlies the rightend of a lever lili which is pivoted at H33 on the housing 63, and which has a link connection Il!) with an arm Iii that is unitarily rockable with a shifter IIE for the clutch element 96. A spring I I3 constantly tends to swing the arm I I I clockwise to close the clutch. kWhen the latch i is released Vby operation of one of the carriage return keys '|'2, the lever IIl is free to move clockwise, resulting in closure of the clutch under the tension of the spring H3. IThe drum 92 is thus power-operated to wind the strap 9i and to draw the typewriter carriage rightwardly.

During the clutch closing movement of the lever l'l, an upright arm Ht thereof swings leftwardly, and through a link H5 having a pin I IS abutting the right side of the counterstop arm t9, swings the latter leftwardly a small distance Within the perforation S! of the housing top plate. In the instituted carriage return, the carriage return limiting margin stop it finally ab.; engages -thevcounterstop ismoving itfto the right -end ofthe opening 6i. Resultingly, through the pin IIE and the 'link IIS, the lever it? -will be restored clockwise -to open clutch position, to the control of the latch mechanism comprising the latch tell.

After the clutch has opened and the momentum of the carriage has died, thercarriage drops back a small distance in letter-feed direction, Ysuch drop-back being facilitated by a back-lash -of the escapement wheel 2t against the 'dog 3i. The drop-back-of the carriage follows any return operation and .leaves the counterstop always free to move to clutch closing position, for example, to activate the carriage return mechanism for eecting a line spacing operation, or to shift the margin stop it to eXtreme leftward position on the carriage, in a manner which will be noted later.

From the above itwill be seen that mere operation of a carriage return key s2 will bring the margin stop @it very nearly against the counterstop t5. Such operation may constitute the iirst step lin the procedure for adjusting the stop i-l.

rlhe second step in the margin stop adjusting procedure entails the unlocking of the stop which in the first step of the adjusting procedure is brought against the counterstop tt. It further entails temporary coupling of the unlocked stop in a stationary reiationship with the counterstop +35. In other words, control of the margin stop to be adjusted is transferred to holding control by the frame, thereby to render the margin stop adjustable by movement thereafter imparted to the carriage, such movement constituting the third step in the stop adjusting procedure.

The stated transfer of control of the individual margin stop it or l5 is eiected by a frame-supported unlockingelement i222 which is capable of downward movement and has a shelf IZB to descend down on and depress the Vmargin stop lock slide 52 to the position seen in Figure 6, wherein the slide nose El? is clear of the rack IH.

A stop unlocking 'key it is provided in the ykeyboard see Figure 7, and, by means to be described, is capable of operating the unlocking element itt. However, as will be seen later, operation Vof Ythe key i2@ has resuitful elfect on the unlocking element 22 oniy if one of the margin stops ii or 55 is brought into margin-gaging relation with the ocunterstop fit. Thus operating pressure may be exerted on said key IZfl prematurely, Ibut downward operation of the releaser I22 will be resultant only when one of the margin stops is in a relation of engagement with the counterstcp it, or foilowing establishment or" such a relation.

Referring to Figure 1,the key 24 comprises the Iforward end of a iever I 5 which is pivoted on a wire E25 and has an upreaching arm I 2. A pull link I28 extends rearwardly from said arm E27 for articulation to a bell crank i3d, the latter fully seen .in Figure 5. Said bell crank I3@ has pivotal support at I Si on an upright ear i322 of a stationary bracket i. A rearwardly extending arm i3d of the bell crank lBll underlies a leftwardly extending lever i3d having pivotal support vat It on an upright web it? of the bracket E33. The latter is rigidly secured by screws'upon the crossbar or" the vframework of the machine. rilhe .left end of the lever |35 overlies a pin H59 on a vertically guided element 938, such element for guidance at its lower end upon the headed stud "S55 being slotted as at Idil. At the upper end the element 38 has a slot Ifl through 9 i which the rod extends, said element being upwardly urged by a spring |42, and the lower end of the slot by engagement with the rod establishing the normal position of the element |33. The rod 15 carries for the element |38, at each lateral side thereof, a confining element, not shown. The releaser |22 comprises a two-part structure including an upper part |43 adjustably `joined to a lower part |54 by screws |45. The lower part |44 of the releaser |22 has a vertical slot |46, and a headed pin |41 projecting from an ear |5 of the element |38 has connection with the part |44 in said slot. A spring 15| stretched between the left end of the pin |41 and a portion of the releaser |22 provides a yieldable connection therebetween, the purpose of which will become evident as the description proceeds.

The upper part of the unlocking element |22 passes through a rectangular hole in a slide |52, the latter of which is carried for limited forward movement on the underside of the top plate 62. For guiding the slide |52, two shouldered studs |53 and |513 reach upwardly through slots |55 provided in the slide, and are fast on the underside of the plate A spring |56, attached to an ear of the slide |52, urges the latter rearwardly to normal position seen in Figures 1 and 5, wherein the pin |54 is engaged by the front end of its slot |55. In such position of the slide |52, the unlocking element I 22 is blocked against downward movement .by a protuberance |51 on the top plate 632, said protuberance underlying a shoulder provided by the upper side of a hole |66 in the element |22. The protuberance |51 and the shoulder may be considered to constitute a primary blocking means for the elen ment |22, which means is effective at all times except when one or the other margin stop 44, 45 is at or close to the counterstop 46. The primary blocking means is automatically released when either margin stop 34, iii approaches man gin limiting engagement with the counter stop 4S. Specifically, the margin stop 44 carries a cam element I6I at the front side thereof, which, when such margin stop approaches margin limiting engagement with the counterstop 46, is effective to cam the element forwardly, about the pin |41, by camming engagement with a cam tappet- |62 on the rear side of the releaser. rThe element |22 has at a higher level another cam tappet |63 which is engageable by a cam element |54 on the margin stop 45 to the same stated end. It will thus be seen that the primary blocking means constituted by the protuberance |51 a-nd related shoulder is rendered ineffective when either of the margin stops 44, 45 nears the limit of carriage travel established thereby. The element |22 is flanked against lateral thrusts by two upright members |53 reaching from the plate 62.

A secondary or supplementary blocking means blocks downward operation of the element |22 when either margin stop rides into the neighborhood of the counterstop 4 5, but is automatically incapacitated as either or the margin stops reaches substantially exact margin-gaging position against the counterstop 46. Such secondary blocking means comprises on each one of the stops 44, 45 a member |55 which is slidably carried for downward displacement in a groove |65 of the respective stop block. A plate |61 facing the front side of the stop block, retains the slide member. The plates |61 have ears Iii@ flanking the opposite sides of the stop blocks, and screws I1| at said ears secure said plates to the blocks. The sliding members |55 have each a rearwardly reaching lip I 12 overlying a compression springi |13 reaching upwardly from a socket hole in the stop block. Urged by said springs |13, each slide member |65 occupies normally an upper position wherein a stop shoulder |14 thereof abuts a face |15 on the underside of the margin stop. When either of the margin stops 44, 45 nears the counterstop 46, the upper end ,of the slide member |65 of such stop will ride closely underneath the releaser shelf |23, while the lower end will ride closely over the housing top plate 52, the space between the normal position of the shelf |23 and the top plate 62 of the housing being slightly greater than the length of the slide member |65.

Toward conclusion of the leftward displacement of the counterstop 46 by the line-end margin stop 45, the lower end of the slide member |55 thereof arrives opposite a notch or interruption |16 in the plate 62, and the slide member consequently is then free for depression by the stop unlocking element |22. Similarly, when the carriage return limiting margin stop 44 is arriving at return limiting position, the slide member |65 thereof arrives opposite a notch or interruption |11 in the plate 62 and is then free for depression by the element |22. Inasmuch as said unlocking element |22 is always cammed forwardly just before either margin stop 44 or 45 arrives at margin limiting position, either margin stop when in limiting position against the counterstop is capable of being unlocked by the element |22.

The margin stop 44 or 45 to be adjusted, having been brought to margin determining position against the counterstop 46, the operator operatesthe margin stop unlocking key |24, and resultingly the shelf |23 will descend down on the slide member |65 and on the lock slide 52, causing the former to enter the related notch |16 or |11 and causing the latter to release the stop from the supporting rack 41. It will be observed that the effected engagement of the slide member |65 in the related notch |16 or I 11 will localize the margin stop with reference to the machine frame and the counterstop, and also that the lock slide 52, being a little shorter at the top, will release the margin stop only after the slide member |55 has entered the notch |16 or |11. In other words,

downward movement of the releaser |22 transfers control of the margin from the carriage to the frame reliably in the exact relation to the counterstop.

Under sustained depression of the key |24, and thus with control of the margin stop transferred to the frame, the third step in the margin stop adjusting procedure is taken which involves the impartation of small incremental power-movements to the carriage, leftwardly or rightwardly, to effect the actual margin stop adjustment. The incremental movements of the carriage I5 relatively to the localized margin stop are effected under control of two stepping keys in the said keyboard 39, one key being numbered and when depressed being effective to cause repeated incremental power-movements of the carriage leftwardly to effect rightward repositioning of l the stop on the carriage, and another key being numbered I8I and when depressed being effective to cause repeated incremental power-movements of the carriage rightwardly and thereby effect leftward relocation of the stop on the carriage.

The means which is responsive to said key IS to effect step-wise adjustment of a margin stop rightwardly will now be described. The key |80 is on a key lever |82 which has pivotal support on a pivot wire |83 and which is urged up-` wardly to the normal position seen in Figure 1 by a spring |89. Engagement of the actuator |86is effected responsive to operation of the key |89, through a cam face |78 on an upright ele" ment |35 of the lever |82, which cam face by action on a lug |79 of the actuator displaces the latter downwardly. Said actuator has a snatch pawl |87 pivoted thereon for some limited movement, and normally clear of the power member 38. A pendant arm, pivoted on an axis |99, supports the front end of the actuator movably in forward direction. A link |9| connects the rear end of the actuator |89 with an upright arm |92 of a pivoted structure comprising also an arm |93 having camming association with a roll |94 carried on the escapement rocker 33. Said pivoted structure includes further a connecting rock shaft |95 for the arms, pivotally supported on the framework of the machine and including also a downreaching arm |99 whereto there is connectedV a spring |97 which biases the pivoted structure |92, |93, |95 to return to the normal position seen in Figure 1, wherein the escapement rocker 33 under the tension of a spring indicated at 292. is in carriage holding position. A return spring |99 for the actuator |99 is arranged to bias the same upwardly against a stationary bar 209, and rearwardly for the pendant arm |83 to abut at 29|. When the stop release key |89 is operated, the actuator |89 is driven forwardly in consequence of thev connection effected between the snatch pawl |87 and the power member 38, and the movement isA transmitted to the arm |93 which operatesthe escapement rocker 33 by camming action on the roller |96. Consequently, the escapement rocker 33 swings thedog 34 into mesh with the escapement wheel. 26 and withdraws the dog 3|.. Subsequently, the actuator |89 is divorced automatically from the power member 38 by engagement of one of the teeth of the latter with a lug 292. consequential to the return of the actuator, the escapement rocker moves toward normal position under the tension of the spring 293. I-f at this time theY key |82v is still held depressed, there will be eiected a reengagement of the actuator |96 with the power member 39 by reason of the lug |79 riding downwardly and rearwardly along the cam face |78 of the upright member 85. Thus another power .1.

operation of the escapement will ensue, and further escapement operations will ensue until the key |89 is released, and the cam face |78- is consequently out of the path of the returning actuator lug |79. Margin stop adjustment right- Wardly on the carriage to any position may thus be effected under control of the key |89, in rapid successive steps or increments by easy manipula-A tive action of the key |99.

To. aid the spring |99 to eiect the return of the actuator |96, there is provided a lever 29d which normally bears on the pendant arm |98 under the tension of a spring 295. This lever 29d, by reason of its momentum attained leaves the arm |85 when ther actuator |86 becomes dis connected. Resultingly, the iirst part of the return stroke of the actuator 8B is effected sole ly under power of the spring |98. Just about the time when the lug |79 in its return nears the cam face |78, the lever 221| catches up with the returning pendant arm |89, and will exert a force thereon to assure reliable downward camming action of the lug |79 by the cam |78.

The machine embodies a conventional space bar 2|0, which through connections, not shown,

and including a key-less lever to the left of the lever |92, is adapted to operate a hook member 2 down on said lug |79 to engage the actuator |29. Such operation of the hook member 2H will result in a single operation of the actuator |89, even though the key 2li) may be held depressed. This is because the lug |79 of the returning actuator |86 will on its return contact the hook member above the hook shoulder.

The upright member |85 is adjustably supported on the lever |82 to correlate the cam face |79 properly with the lug |79. To the stated end the upright member |95 is slidably supported in vertical direction upon the key lever |92 by means including a pin and slot connection 2|2, and a strong spring 2|3, arranged between the member |95 and the key lever I 82, maintains the latter in engagement with an adjustable eccentric 2||| on the key lever. In operation the member |85 is unitary with the lever |82.

The aforesaid key |8| and mechanism controlled thereby for effecting leftward adjustment of either margin stop incrementally by step-wise power movement of the carriage is illustrated in Figui-cs2 and 10. The key |8| is part of a, lever 22| which is pivoted at 222 and is biased by a spring 223- to the normal position seen in Figure 2. A cam element 224, turnably carried on a reduced portion 225 of the toothed power member 32 near the left side plate of the machine, supports pivotally, as at 226, a clutch pawl 227. Said pawl is urged to swing into engagement with a toothed wheel 229 by a spring 239, the toothed wheel being fast on the reduced shaft portion 225. A dog 23|, pivotally supported at 232, is normally in engagement with a shoulder of the pawl 227 for holding the latter clear of the wheel 228. Said dog is controlled by the key lever 22| through a pin-andfork connection therewith at 233. The cam element 2213 is adapted to operate a bail structure comprising an arm 2311i closely to the left side wall 2@ of the machine, an arm 235 near the middle of the machine, and a rock shaft 239 connecting the two arms rigidly. A follower roller 239 on the arm 23d contacts the cam element 224, and a pawl 237 connected to the arm 239 has its front end normally cammed clear of the escapement wheel 26 by a cam face 238 on the pawl contacting a stationary guide stud 2de, see Figure 10. The shaft 236 has pivotal support at its right end in a frame boss 2fl| whereas the left end pivots normally in the lower end of a slot 2152 due to a strong spring 243 having anchorage on the frame and being hooked to the shaft 236. There will be idle displacement of the left end of the shaft upwardly in the slot 242 whenever the pawl 237 is unable to turn the escapement wheel 2B due to the carriage having reached limit position. The roller 299 follows the cam element 221| under the tension of a spring 2M attached to the arm 234. A drop 2da on the cam, in conjunction with. the roller 239, insures against backward rotation of the cam element following,r the throw-offv of the clutch pawl 227. It will be seen that operation of the key |8| swings the dog 23| free of the pawl 227, lcausing the latter to engage the toothed wheel 228 under influence of the spring 239. Inasmuch as the toothed wheel 228 is constantly turning in the direction of the arrow, it follows that the cam element 2213 then turns with the power member 38 so long as the key |8| re- :mains depressed, and will complete a. started turn after the release of the key, the dog 23|, intercepting then the clutch pawl 221 and swinging it free of the teeth of the wheel 228. The cam 224 power rotating under control of the key |8| causes repeated rocking movements of the structure 234, 235, 236 resulting in reciprocations of the pawl 231 which turn the es-capement wheel 26 step-wise to step-wise move the carriage in rightward direction. Such step-wise movement eiected after a margin stop has been unlocked and rendered stationary with respect to the frame, results in leftward step-wise adjustment of such stop.

It is conventional practice to provide means whereby responsive to the carriage riding to a line-end position, further typing and word spacing operations are automatically suppressed. Typing operations in the present machine are suppressed at line ends in the same manner as disclosed in the patent to Yaeger, No. 2,362,229, dated November 7, 1944. Namely, a toothed bar 248 slidably carried upon a cross bar 256, as at for a short rightward movement from the position seen in Figure 9. Normally the rear ends or the type action actuators 31 overlie notches between teeth 252 of the bar, and such actuators are thus freely connectable to the power member 38 for power operation. However, when the lineend margin stop displaces the counterstop 46 leftwardly, the teeth 25| come to lie underneath the actuators 31, rendering them incapable of connection to the power member 3S, and thus incapable of operation. The rightward movement of the toothed bar 248 results when the counterstop arm is displaced leftwardly by the stop 45 and displaces an arm 254 pivoted upon the framework of the machine on a stud 255 and connected through a spring 256 to a lever 251, the llatter also pivoted at 255 and having a pin-andork connection 253 with the bar 248. A rearwardly extending arm 258 of the lever 251 pro- .vides for reliable return movement of the bar 248 whenever the counterstop is free to assume normal, rightward position under the power of the spring 68,

According to the invention the leftward displacement of the counterstop 46 blocks the space actuator |86 against connection with the power member 36 by the key 2m. Nevertheless such space actuator |86 is readily connectable to the power member under control of the repeat stepping key |68. To accomplish this, the toothed bar 248 carries pivotally thereon, at 266, a lever 26| which includes an upright ear 262. A spring 263 urges said lever 26| normally against a stop pin 259 on the bar, and in this position of said lever the ear 262 is slightly to the left of the link |51' reaching rearwardly from the actuator |65. When the margin stop 45 operates the counterstop 46, the lever 26| will move rightwardly with the slide, and the ear 262 will become positioned underneath the link |9|, to block the link |9| against downward motion necessary to connect the actuator |66 to the power member 56. Carriage spacing operation under control of the regula-r space key 256 is then prevented so long as the counterstop 46 remains leitwardly displaced.

For margin stop adjustment it is required to step-move the carriage while the margin stop 45 is in line-end locking position, and accordingly the stepping key |86, when operated is eiective to move iirst the blocking ear from under the link |8|. To this desired end the key lever |62 has an arm 264 reaching upwardly to the rear o an arm 265 of the lever 26|, to swing the latter clockwise for leftward displacement of the ear 262 from under the link |9|. The arrangement is such that initial movement of the key lever |82 releases rst the blocking condition established by the ear 262 and that dur ing further movement of said key lever the cam face |18 will act on the actuator lug |19 to lower the actuator |66 for power operation. It will be noted that, although as stated the stepping key is operable for effecting margin stop adjustment, the type actuators 31 remain blocked in idle position by the teeth 252 until, following the conclusion or the margin stop adjustment, the margin stop is moved rightwardly by the carriage, away from the counterstop 46, as by operation of one of the carriage return keys 12.

To move the carriage beyond either of the line limits defined by the said stops 44 and 45, the machine includes a usual margin release key 266 on a lever 261, see Figures 5 and 7. The lever 261 is adapted to operate a transverse lever 268, the left end of which is seen in Figure 9 and is adapted to lower the counterstop arm 60 including its stop end 46 below the margin stops, the lock bar 248 in any event assuming then ineffective position.

The manipulative procedure for adjusting either of the margin stops 44 or 45, will now be described briefly in connection with the manipulative controls which have been described hereinabove.

If the left margin stop 44 is to be adjusted, the operator lingers a carriage return key 12, which brings such margin stop as a unitary part or the carriage against the counterstop 46. This is the first step in the procedure and may be omitted if the operator knows that the appropriate margin stop is already against the counterstop. 1n case of doubt the operator touches the return key 12 to make certain that the stop will be against the counterstop.

Thereupon, as the second step in the procedure, the stop unlocking key |24 is operated, resulting in the operation of the element |22 downwardly to unlock the stop 44 from the carriage and concomitantly to lock it to the frame, stationary with respect to the counterstop 46.

The third step in the procedure consists of operating the appropriate stepping key |86 or |8| for effecting repeatedly power stepping movements of the carriage, thereby to cause adjustment of the stop 44 rightwardly or leitwardly on the carriage, as may be required, the release key |24 being meanwhile still held depressed.

By appropriately timing the release of the operated stepping key, the desired position or" the margin stop 44 on the carriage is obtained. The release of the key |80 or |8|, coupled with a release of the stop unlocking key |24 may be regarded as the fourth or iinal step in the margin stop adjusting procedure. As a result of this fourth step the margin stop 44 is appropriately locked to the carriage rack 41 by the restoration of the lock slide 52, and freed from control by le frame by the restoration of the slide member The procedure for adjusting the right margin stop 45 is similar, but to bring such stop against the counterstop, the tabulator key 1| is operated instead of the carriage return key. The tabulator key need not be operated if the stop 45 is in line-limiting position against the counterstop 46. As in the case of adjusting the margin stop 44, the stop unlocking key |24 is then operated to transfer control of the stop 45 from the carriage to the frame. step in the procedure, which consists of operating the appropriate stepping key |82` or lill` for a period until power adjustment of the unlocked margin stop #l leftwardly or rightward'ly on the carriage to the appropriate position has been effected by carriage movement. Finally the operated key |89 or and the key |24 are released, which will render the adjusted stop 45 locked to the carriage and unlocked from the frame.

In view of the rapidity with which the carriage moves step-wise under control of the keys |82, lili, the bringing of either margin step against the counterstop 46 may be advantageously combined with the movement of the carriage required for outwardly adjusting the margin stop. To accomplish this the stop unlocking key |22 and the appropriate stepping key |80 or It! may be operated concomitantly. The margin stop which in such case is initially still locked to the carriage will then iirst move bodily with the carriage into position against the counterstop, and in an automatic manner the unlocking member |22 will then descend to effect a transfer of control of the aiected stop from the carriage to the frame, and in a continuing manner the shifting of the stop to the wanted position will be accomplished, the operator releasing the stepping key at the appropriate time concomitantly with or followed by a release of the key |2.

It will be noted that the operators yactions for adjusting either of the stops lill or 45 are confined to the lightly operativev manipulative means comprising the several stated keys in the keyboard 3B. Also, that the procedure involves the same steps for adjustment of either margin stop, except that the proper key 7| or 72 must be operated to bring the appropriate stop 44 or 45 lrst against the counterstop. The operators hands never need move from the keyboard 39 and the adjustment is effected rapidly with almost no effort on the part of the operator.

If a margin stop needs to be shifted only a single space, the appropriate key |80 or |8| is simply tripped once or twice. If the required adjustment is of considerable extent, one may hold the key |80 or |8i depressed until the approximate point approaches where the stop is desired to be located and the accurate point of adjustment may then Ibe obtained by momentarily depressing the key |82 or |3| once or twice more.

In most instances a margin stop adjustment is best effected by depressing in the procedure the stop unlocking key 22 after the operationof the tabulator key 7| or after the operation of theV carriage return key 12. However, one may advantageously adjust the left margin stop '44 inwardly to a position defined or predetermined by a set tabulator stop TI. A carriage return key 'l2 is first operated to bring the margin stop'44 into engagement with the counterstop. Thereupon, by operation of the stop unlocking'key |24, followed by operation of the tabulator key 3|, the adjustment of the stop 44 is speedily eiected by tabulating travel of the carriage, the said two keys 7i and |22 thereupon released to render the adjustment xed.

The left margin stop il may be adjusted in a quick run to the extreme line-start position from any position short thereof, by mere operation of the stop unlocking key |24 and the carriagev return key 12. If these keys i2 and |24 are operated conjointly, or substantially conjointly, the

This is followed by the third stop 44- will first move unitarily with the carriage against the counterstcp. Then the stop unlocking element |22 will descend automatically under power of the key-tensioned spring i 5|, and a transfer of control of the stop IM from the carriage to the frame ensues with the counterstop 46 remaining standing off the rightward end of the perforation 6|, and the clutch remaining closed. The carriage return run, meanwhile continues until terminated by the abutment |13 on the left carriage end l2, contacting and displacing the counterstop l5 rightwardly. When thereafter the operated keys are released, the stop Afl will have been secured in extreme linestart position.

It will be noted from the preceding two paragraphs that the margin stop LM is quickly shiftlable under keyboard control in fast, uninterrupted runs, between two predetermined margin determining positions.

Damage to the mechanism due to improper use is virtually impossible. For example, should the operator inadvertently operate the carriage return key l2 after a transfer of control of the margin stop l5 to the frame through operation of the key |25, an automatic shut-off of the power carriage return will nevertheless ensue. Consequential to a power return operation instituted as above noted, when the stop it approaches the stop unlocking element 22, the rightwardly extending screw il! on the stop lli engages the screw lli which faces toward it from the stop @35, and forces the latter rightwardly under carriage return power. This cams the slide member |55 on the stop l5 upwardly, inasmuch as such slide member U35 has a cam face 22; for gliding out of the beveled side of the recess I'l. In being cammed upwardly, the slide H35 lifts the stop unlocking element E22 by contact with its shelf |23. A path is thus opened for the stop Zilli with its parts 52, |65 to ride between said shelf |23 and the housing top plate E2. As the slide 65 on the stop 4d moves over the notch i?? it will move thereinto and stop 22 will consequently become unlocked from the carriage. Return movement continues thereafter until a projecting abutment 273 on the left carriage end, see Figure l, displaces the counterstop 36 rightwardly to shut-olf position. The inadvertently instituted return is thus automatically terminated without its having caused any harm. The slide member |555 of the stop i2 has a short bevel 2li, so that in its rightward movement it may not catch on the shelf |23. Upon termination of the stated inadvertent carriage return operation the desired margin stop setting operation may then still be effected in the intended manner.

In a somewhat similar manner, a tie-up is guarded against also when the operator inadvertently operates the tabulator key 'H after having first effected a transfer of control of the stop dll from the carriage to the frame by the operation of the key ld. Without the feature'which is here to be brought out, an institution of a tabulation as stated, under absence of a tabulator stop 'Il in encountering relation with the reed it, would result in tabulating travel of the carriage, stopped short by the right margin stop iii encountering the left margin stop lii. This would leave the tabulator reed it in projected position. Moreover, no restoration of the reed 'it could be eeoted by any carriage movement, and the escapement releasing arm 32, operated in response to the operation of the tabulator key would remain operated, leaving the machine tied up against further use.

According to the invention the margin stop 45, in a tabulation effected under the above stated condition, when it nears 4the element |22, displaces the stop 45 leftwardly away from the counterstop by the abutment of the aforesaid Screws lll. This causes upward camming of the slide |65 on the stop 44, such slide having a cam face 27d like the one on the stop 45 for riding out of a beveled side of the notch lll. Clearance will thus be provided by the upward displacement of the shelf 23 for the stop 45 to ride leftwardly and displace the counterstop 4B leftwardly. The pin 81, on the counterstop arm 69, see Figure l, imparts ultimately a leftward movement to the upper end of the tabulator reed 'I6 to free its shoulder 85 from the shelf s6 to thereby cause the restoration of the reed 'I6 with consequent reestablishment of the escapement control. The margin stop 45 becomes released by downward movement of the unlocking member 122 under the tension of the spring ISI. If the spring l5! is made strong enough for the slide member 55 of the margin stop 45 to seat itself firmly down in the notch |16 against the resistance of the rightwardly pulling springs 68 and E3 respectively associated with the counterstop and the tabulator reed, the counterstop will receive said leftward movement immediately after the stop reaches it. However the spring may be made weaker and insufficiently strong to force the slide member 165 fully down into the recess, but yet strong enough to release the stop slide on the stop 45, in which case the leftward displacement of the counterstop will ensue only after the margin stop supporting rack has advanced through the stop 45 to the limit provided by the right carriage end l5. In either case `the tabulator reed 'i6 will be withdrawn as the result of the tabulation, and thus is not apt to cause any trouble when a carriage returning operation is succeedingly instituted. Furthermore, the operator may then still effect the intended setting of the stop 44.

Thus the various power agencies employed in the margin stop setting operation will not tie-up or damage the machine in the event they are operated or used improperly.

While the form of mechanism herein shown and described is admirably adapted to fulfill the objects stated, it is to be understood that it is not intended to coniine the invention to the forms or embodiments herein described, for the invention is susceptable of embodiment in various riage movable lineally in opposite directions on said frame, margin stop-s for limiting the opposite directional movements of the carriage, means to support said stops for adjustment in parallel with the movement of the carriage, said stops being normally locked in adjusted position and in condition for release, counterstop means for movement-limiting engagement with the margin stops, power-actuated means for moving the carriage in either direction for engagement of either locked margin stop with the counterstop means, other power-actuated means for rapidly moving the carriage in successive increments in either direction after a margin stop has been engaged with the counterstop means, a keyboard, and means having manipulative devices in or ,near

said keyboard, to initiate the first said poweractuated means tov cause engagement with the counterstop means, of the margin stop which is to be adjusted, to unlock the engaged margin stop and render it stationary with respect to the counterstop means, and to effectuate said other power-actuated means for rapid movement of the carriage in the appropriate direction in successive increments until a desired new position of the unlocked margin stop is obtained.

2. The invention set forth in claim l, said manipulative devices including a key responsive to which the engaged margin stop is unlocked and rendered stationary with respect to the frame, and including also control means to eifectuate said other power-actuated means for appropriate directional movement of the carriage.

3. In a typewriting machine, a frame, a paper supporting carriage having a rack, adjustable margin stops normally in position-controlling engagement with the rack, -a counterstop on the frame; power-actuated means for moving the carriage in opposite directions to selectively move the margin stops to the counterstop for an adjusting operation, means to transfer the selected stop from control by the rack to control by the frame to permit the carriage to pass by the stop in either direction, other power-actuated means for eiecting successive incremental movements of the carriage in either direction While control of the stop is transferred, thereby to obtain the desired position of the transferred stop on the carriage, and means operable at the will of the operator for controlling the operation of all of the said power-actuated means and the stoptransferring means.

4. The invention set forth in claim 3, the last said means including a tabulator key, a carriagereturn key, a stop-setting key for effecting said temporary transfer, and directional keys for control of said other power-actuated means to effect the desired incremental movements of the carriage in the required direction.

5. The invention set forth in claim 4, said machine having a keyboard, and all of said keys being in the area of or adjacent to the keyboard.

6. In a typewriter machine having a frame, a carriage movable thereon and provided with a rack, adjustable right and left margin stops in margin controlling engagement with said rack, and counterstop means on the frame; poweractuated means for moving the carriage in opposite directions to selectively move the margin stops to engage the counterstop means in preparation of a margin stop adjusting operation, means for temporarily transferring the selected stop from control by the rack to control by the frame to permit the carriage to pass by the selected stop in either direction, other poweractuated means for effecting movements of the carriage in letter-feed increments in either direction, after the control of the selected stop is transferred, to effect a repositioning oi the selected stop on the carriage, a space-key to control said other power-actuated means for movement of the carriage in single letter-feed direction in letter-feed steps, a line-end lock for said other power-actuated means to incapacitate it in regard to effecting letter-feed steps of the carriage under control of said space-key, and means other than said space-key, differentially operable at the will of the operator for controlling said two power-actuated means and the stoptransferring means, and including means for disabling said line-end lock responsive to operate tion of the differentially operable means and-to control said other power-actuated means to efrect power-movements. of the carriage in letterfeed direction.

7. The invention set iorth in claim 6, said machine having a keyboard, and said differentially operable controlling means including manipulative devices in or adjacent the keyboard by which to differentially operate it.

8. In a typewriting machine, a frame, a carriage oppositely movable lineally in letter-feed and in return directions on the frame, a linestart and a line-end margin stop for limiting the opposite movements of the carriage, means to support said stops for adjustment in parallel with the carriage, said stops normally locked in adjusted positions and in condition for release, counterstop means for movement-limiting coaction With said margin stop, power-actuated means to step the carriage incrementally in letter-feed direction, a line-end lock for said poweractuated means rendered effective under control of the line-end margin stop in approach of the line-end, a key to render said power-actuated means effective to step the carriage a single increment in letter-feed direction except when said line-end lock is active, manipulative means to unlock any margin stop brought into movementlimiting coaction with said counterstop means, and further to render such margin stop stationary With respect to the counterstop means, and means including manipulative means to render said power-actuated means effective for repeated step movement of the carriage in letter-feed direction, and including means to release the line-end lock for step-movement of the carriage in letter-feed direction.

9. In a typewriting machine, a frame, a carriage movable lineally in letter-feed and in return directions on said frame, a carriage-return and a line-end margin stop, means to support said margin stops for adjustment in parallel with the movement of the carriage, said stops being normally locked in adjusted positions and in condition for release, counterstop means for opposite movement limiting engagement with the margin stops, letter-feed means normally in control of the carriage and operable to cause the carriage to letter feed, a carriage return key, power-means responsive to said key to return the carriage to a position of engagement of the carriage return margin stop with the counterstop means, means including a tabulating key to tabulate the carriage in letter-feed direction to a position of engagement of the line-end margin stop `with the counterstop means, means including a key to unlock the engaged margin stop and to render such stop stationary with respect to the counterstop means, power-means to step-move the oarriage in carriage return direction, power-means to operate said letter-feed means, a key for each of said last two power means, and means responsive to the operation of each said last two keys to cause its related power-means to function repeatedly during key operation, said various keys being all located in the keyboard or in close adjacency thereto, wherefore adjustment of either margin stop may be speedily eiected without lifting the hands from the keyboard.

l0. In a typevrriting machine, a frame, a carriage movable lineally'on said frame, a margin stop, means to support said margin stop for afjustment in parallel with the movement of the carriage, means to lock said margin stop in adjusted position and in condition for release, a

4 2G counterstop with which said margin stop assumes an engaged relation in limiting carriage travel in one direction, a device to release the margin stop locking means and concomitantly to lock the margin stop stationary with respect to the counterstop, said device comprising a manual control operable to an operated position independently of the prevalent positional relation ci the margin stop with the counterstop, and means controlled by the margin stop to cause the device upon operation of said control to function eri-ectively to release said margin stop locking means and lock the margin stop stationary with respect to the counterstop, either if the margin stop in engaged relation with the counterstop or consequently to establishment of such relation by a carriage movement.

11. The invention set forth in claim 10, said machine embodying a keyboard, and said manual control being in or adjacent the keyboard.

l2. In a typevvriting machine, a frame, a carriage movable iineally on said ira-me, a margin stop, means to support said margin stop for adjustment in parallel with the movement of the carriage, means to lock said margin stop in adjusted position and in condition for release, a counterstop with which said margin stop assumes an engaged relation in limiting carriage travel in one direction, anda device to release the margin stop locking means and concomitantly to lock the margin stop stationary With respect to the ccunterstop, said device comprising manual control means and means controlled by the margin stop and effective upon operation of the manual control means to cause the device to function eiiectively and lock the margin stop stationary with respect to the counterstop either ii the margin stop is in engaged relation with the counterstop or consequently to establishment of such relation by a carriage movement, said controlled means comprising a flexible element capacitated the operation of said control means for stop unlocking action but controlled by the margin stop to cause the device to function as stated.

13. In a typewriting machine, a frame, a carriage movable lineally on said frame, margin stops for limiting the opposite directional movements of the carriage, means to support said margin stops for adjustment in parallel with the movement of the carriage, means to lock said margin stops in individually adjusted positions and in condition for release, oounterstop means with which the individual margin stops engage in determining opposite Writing line margins, and means to release the margin stop looking means for either stop and concomitantly to iock the released margin stop stationary with respect to the counterstop means, said releasing means comprising manual control means operable independently of the prevalent position oi the oarriage, and means controlled by the margin stops and effective upon operation oi said control means to cause the releasing means to function either with respect to a margin stop which is in engaged relation With the counterstop means or with respect to a margin stop which a carriage movement is moved into engaged relation with the counterstop means While the manual control remains operated.

14. In a typewriting machine, a frame, a carriage movable lineally on said frame, a margin stop, means to support said margin stop for adjustment in parallel with the movement of the carriage, means to lock said margin stop in adjusted position and in condition for release, a

aumentarA` counterstop with which said margin stop assumes an engaged relation in limiting carriage travel in one direction, a device including a remotely located manipulative control, to release the margin stop locking means and to lock the margin stop stationary with respect to the counterstop, comprising, a lock releasing element, and exibly yieldable means intermediate said manipulative control and the releasing element, and means including margin stop carried means, in control over said releasing element so that when said manipulative control is operated, said releasing element will function and lock said margin stop stationary with respect to the counterstop either if the margin stop is in a relation' of engagement with the counterstop or consequently to establishment oi such relation.

15. The invention set forth in claim 14, said margin stop carried means Which is in control over said releasing element comprising blocking means therefor active unless or until the margin stop is in said relation of engagement with the counterstop,

16. In a typewriting machine, a frame, a carriage movable lineally on said frame, a margin stop, means to support said margin stop for adjustment in parallel with the carriage, means to lock said margin stop releasably in adjusted position, including a releasable lock member carried by the margin stop, a counterstop relatively to which the margin stop is adapted to be brought into an engaged relation for limiting carriage travel in one direction, said counterstop and said margin stop being one on the frame and one on said carriage, a releaser for said lock member, laterally situated stationary with respect to the counterstop, and in operative relation with the lock member only when the margin stop is in the proximity of the counterstop, said releaser operable transversely of the carriage to release said lock member, a primary blocking means including a tappet control on the margin stop, to block the releaser against operation over the whole range of carriage travel except when the margin stop is in the proximity of the counterstop, and a secondary blocking means comprising, a blocking surface located and extending parallel to the carriage for a short distance at the proximity of the counterstop and having an interruption, and comprising further a device on the margin stop which under control of said blocking surface during ineffectiveness of the primary blocking means renders the releaser operable only when the carriage is positioned at or moved substantially to the exact position in Which the margin stop is in said relation of engagement with the counterstop.

17. The invention set forth in claim 16, including a manually operable control, and means responsive to operation of said control to urge said releaser to operated position, the releaser moving then to operated position if or as soon as the two blocking means permit it.

18. In a typewriting machine, a fra-me, a carriage movable lineally on said frame, a margin stop, means to support said margin stop for adjustment in parallel with the carriage, means to lock said margin stop releasably in adjusted position, including a releasable lock member carried by the margin stop, a counterstop relatively to which the margin stop is adapted to be brought into an engaged relation for` limiting carriage travel in one direction, an element operable transversely of the carriage for effecting the release of said lock member, lateralli7 situated stationary with respect to the counterstop, and posed in position for effecting the release of the lock member only when the margin stop is in the proximity of the counterstop, means including a tappet control on the margin stop, to lock said element against effective operation except when the carriage is positioned at or is moved substantially to the exact position in which the margin stop is in said relation of engagement with the counterstop, a con trol operable to an operated position, and means responsive to operation of said control to operated position to operate said element if or as soon as said locking means permits it.

19. The invention set forth in claim 18, including means to hold the margin stop stationariy during the release of the said lock member.

20. The invention set forth in claim 19, said holding means comprising means operable bi' said element to a holding position.

21. In a typewriting machine, a frame, a carriage movable lineally on said frame, opposite end margin stops, counterstop means with which said margin stops cooperate for limiting the opposite directional movements of the carriage, means to support said margin stops for adjustment in parallel with the movement of the carriage, means for locking the margin stop in different positions of adjustment and in condition for individual release, a margin stop releaser laterally coincident approximately with the counterstop means and operable transversely to the line of carriage travel to release the margin stop locking means and lock said stop stationary with respect to the counterstop means, a manipulative control operable at will, and means for effectively causing the operation of said releaser consequential to operation of said manipulative control only with respect to a margin stop which is in movement limiting relation with the counterstop means, or with respect to a margin stop which by carriage movement is brought into such relation while the manipulative control remains operated. said causing means including means comprising a tappet control on each margin stop to control the releaser for an operation thereof to ensue only after one or the othel` margin stop is in engaged rela-tion with the counterstop means.

22. The invention set forth in claim 21, including means on each margin stop operable by the releaser to hold the released margin stop stationary in relation with the engaged counterstop means.

23. In a typewriting machine, a frame, a carriage movable lineally on said frame, a margin stop, a counterstop, means to support said margin stop for adjustment on the carriage in parallel with the movement of the carriage, including a releasable latch member on the margin stop, a frame supported releaser for said latch member, operable transversely to the carriage and having a lateral location substantially corresponding to the counterstop, a frame-supported means JDO block operation of said releaser, tappet means on the margin stop to free the releaser from the blocking means when the margin stop approaches the counterstop, and means to hold the margin stop upon its release stationary with respect to the frame, comprising, an element on the margin stop projectible by operation of said releaser, and surface means on said frame to block said element against projection, said surface means extending parallel to the carriage and having an interruption whereinto said element is holdingly 22s projectible only whenith'e margin stop is engaged with the. counterstop, said element lWhen'it is blocked, in turn blocking the'said margin stop releaser.

24. The invention set forth in claim 23, including, a manipulative control, and resilient means to operate said releaser by said manipulative control.

25. 1n a typewriting machine having a frame and having a carriage lineally movable on said frame, a left and aright margin stop, counterstop means for contact with said stops for right and left margin establishing action, means to support said stops for adjustment in parallel with the carriage to different margin defining positions, means conditionable to hold either stop in contacting relationship with the counterstop means after establishment of such relationship, said supporting means and said holding means including on each stop norm-ally active latch means and normally released detent means, said latch means constituting part of said stop supporting means and said detent' means constituting part of said holding means, means including means operable transversely of the carriage and situated laterally coincident substantially with the counterstop means to engage said detent means and release said latch means of either stop contacting the counterstop means, notch means constituting part oi. said holding means and engageable by the individual detent means of whichever stop is in Contact with the counterstop, surface means at either side of the notch means extending parallel to the carriage, said notch means :and detent means including cam faces for the forcing of the detent means of either stop out of the notch means by forced outward movement of either stop which may be contacting the counterstop means, and means to render either stop displaceable outwardly from engaged relation with the counterstop means in the approach of the other stop toward the operable means, this forcing the detent means on the outwardly displaced stop out of the notch means to ride on said surface means, the forcing of the detent means out of the notch means causing a restoration of the operable means to provide clearance for movement of the displacing stop against the counterstop means.

26. In a typewriting machine having a frame a carriage power-movable on the frame in letterfeed and return directions, opposite end margin stops on the carriage and la counterstop means on the frame for limiting the opposite directional movements of the carriage, a keyboard, motor means andA power transmission' devices von said frame, and manipulative devices in the region of said keyboard for' controlling the applicationofV power to variousoperating mechanisms including a carriage letter-feed, a carriage repeat-letterfeed, a carriage repeat-back-spacer, a carriage tabulator and a carriage-return mechanism; the combination of means for locking the margin stops in` adjusted position on the carriage,means controlled by a manipulative device in the keyboard region for operating said locking means to inlock the margin stop from the carriage and lock it to the frame, means including said power transmission devices and under control of certain of said manipulative devices for optionally moving the carriage. in either direction to engage either margin stop with the counterstop means, and means including said carriage repeatletter-feed, carriage repeat-back-spacer, and the said manipulative devices therefor, for power moving the carriage in either direction as desired while the selected stop is held unlocked from the carriage. A

27. In a typewriting machine having a frame, a carriage power-movable on the frame in letterfeed and return directions, opposite-end-margin stops on the carriage and a counterstop means on the frame for limiting the opposite directional movements of the carriage, a keyboard, motor means and power transmission devices on said frame, and manipulative devices in the region of said keyboard for controlling the application of power to various operating mechanisms including a carriage letter-feed, a carriage repeatletter-feed, a carriage repeat-back-spacer, a carriage tabulator and a carriage-return mechanism; the combination of means for locking the margin stops in adjusted positions on the carriage, means controlled by a manipulative device in the keyboard region for operating said locking means to unlock the margin stop from the carriage and to lock it to the frame, means including said power transmission devices and under control of certain of said manipulative devices for optionally moving the carriage in either direction to engage either margin stop with the counterstop means, and means including said carriage repeat-letter-feed, carriage repeatback-spacer, and the said manipulative devices therefor, for power moving the carriage as desired either in successive repeat movements or in single increments while the selected stop is held unlocked from the carriage, the said manipulative device for operating said locking means being operable either before or after a margin stop is engaged with the counterstop means and the locking of the margin stop to the frame being delayed until the margin stop is engaged with the counterstop means.

2B. ln a type-writing machine, a frame, a carriage movable lineally in letter-feed and in return directions on said frame, a margin stop, means to support said margin stop for adjustment in parallel with the movement of the carriage, said stop being normally locked in adjusted position and in a condition for release, counterstop means for limiting engagement with said margin stop, letter-feed means normally in control of the carriage and operable to cause the carriage to letter-feed, a carriage-return key, power-Ineens normally responsive to said key to return the carriage, meansv including a tabulating key to tahulate the carriage, a device to release the margin stop and to lock the same stationary with respect to the counterstop, said device comprising a control key operable to an operated position independently of the prevalent positionable relation of the margin stop with the counterstop, and means controlled by the margin stop to cause the device upon operation of said control to function effectively to release said margin stop and lock the same stationary with respect to the counterstop, either if the carriage stop is in engaged relation with the counterstop or consequently to establishment of such relation by carriage movement in the appropriate direction, power-means to step-move the carriage in carriage return direction, powermeans to operate letter-feed means, a key for each of said last two power-means, and means responsive for the duration of operation of each of said last tufo keys to cause its related power-means to function repeatedly, said various keys al1 located in the keyboard or in close adjacency thereto.

29. In a typewriting machine having a letterfeeding carriage, the combination with a lineend margin stop and a counterstop displaceable by said margin stop at line-ends, of typing instrumentalities including type keys, an incremental spacing device for the carriage including a space key, normally idly positioned lock means for said typing instrumentalities and said spacing device, operable to looking position, means to operate said lock means by the displacement of said counterstop at line-ends, and means operable Without effect on said counterstop to unlock said spacing device Without unlocking the typing instrumentalities.

30. In a typewriting machine having a letterfeeding carriage, the combination with a lineend margin stop and a counterstop displaceable by said margin stop at line-ends, of a normally idle power-spacing device for the carriage, a single action space key and a repeat spa-ce key, both normally in control over said power-spacing device, and means operated by the displacement of said counterstop at line-ends to incapacitate said typing instrumentalities and to render said power-spacing device responsive only to the repeat space key.

31. In a typewriting machine, a frame, a carriage movable lineally on said frame, a margin stop, means to support said margin stop for adjustment in parallel with the movement of the carriage, means to lock said margin stop in adjusted position and in condition for release, a

counterstop with which said margin stop assumes an engaged relation in limiting carriage travel in one direction, a device to release the margin stop locking means and to lock the margin stops stationary with respect to the counterstop, said device comprising a manual control, a stop releasing element movable to an operated position for stop releasing action on said margin stop locking means and means to urge said stop releasing element impositively toward operated position responsive to the operation of said manual control, and margin stop controlled means to suppress operation of said stop releasing element by said urging means upon operation of said manual control except if the margin stop is in engaged relation with the counterstop or consequently to establishment of such relation by carriage movement.

WALTER T. SAGNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,594,379 Ramus Aug. 3, 1925 1,748,896 Olivetti Feb. 25, i930 1,851,311 Hokanson Mar. 29, 1932 1,984,410 Hart Dec. 18, 1934 2,209,279 Myers July 23, 1940 2,258,211 Michelsen Oct. 7, 1941 

